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Old 09-04-2019, 11:52 AM   #1
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How should wires be attached to transom anode?

There are two studs going thru the transom that the anode is attached to on the outside of the hull. I currently have one wire attached to one stud. Should there be a wire going to each stud? Maybe run a jumper to the other stud? Or is it correct the way it is? Thanks.
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Old 09-04-2019, 12:00 PM   #2
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Two is better than one but not necessary.
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Old 09-04-2019, 12:00 PM   #3
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Russell, that is your bonding wire.

If so, one is correct.
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Old 09-04-2019, 12:19 PM   #4
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Some use one stud made of a better electrical conductor, maybe gold plated. If that's the case with yours, that would be the bonding connection point.
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Old 09-04-2019, 12:28 PM   #5
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One is ok. The second bolt is to hold the anode in place.
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Old 09-04-2019, 12:42 PM   #6
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For all the belt and suspenders comments on TF every day, no one else is going to suggest a $1 jumper or second wire?
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Old 09-04-2019, 01:38 PM   #7
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For all the belt and suspenders comments on TF every day, no one else is going to suggest a $1 jumper...?
Why? I don't think they feel the cold.
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Old 09-04-2019, 02:16 PM   #8
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For all the belt and suspenders comments on TF every day, no one else is going to suggest a $1 jumper or second wire?
Mine's connected via WiFi.
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Old 09-04-2019, 02:23 PM   #9
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For all the belt and suspenders comments on TF every day, no one else is going to suggest a $1 jumper or second wire?
I am usually one for overdoing something but in this case the two bolts go into the same piece of anode so one good connection should be fine. I don’t see any benefit jumping from one point on the anode to another point on the same piece of anode.
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Old 09-04-2019, 02:43 PM   #10
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I am usually one for overdoing something but in this case the two bolts go into the same piece of anode so one good connection should be fine. I don’t see any benefit jumping from one point on the anode to another point on the same piece of anode.
Anode what you mean!
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Old 09-04-2019, 02:50 PM   #11
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I am usually one for overdoing something but in this case the two bolts go into the same piece of anode so one good connection should be fine. I don’t see any benefit jumping from one point on the anode to another point on the same piece of anode.
Two is better than one...I hear it all the time here.


Where are those guys when you need them?


Sure one is good enough when it's good enough. A second might be low resistance if the other goes higher for whatever reason.


How come that argument fails in so many other threads?
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Old 09-04-2019, 02:54 PM   #12
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You need to connect a wire to that second bolt ASAP! If you don't you are at risk of having your boat sink out from under you.
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Old 09-04-2019, 03:36 PM   #13
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That's the way most threads go....didn't want this one to be the odd duck
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Old 09-04-2019, 05:58 PM   #14
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I always wondered what those 2 bolts were for.
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Old 09-04-2019, 06:35 PM   #15
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I always wondered what those 2 bolts were for.
Then you had better look on the outside and make sure something is there!
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Old 09-04-2019, 06:52 PM   #16
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Well, somebody has to uphold belt and suspenders.

Actually, the only reason I connected to both bolts is because I had two major trunk lines of bonding cable converging near the transom—one with all the ER connections and one for the shaft struts, rudders and aft through hulls.
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Old 09-04-2019, 07:37 PM   #17
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Well, somebody has to uphold belt and suspenders.

Actually, the only reason I connected to both bolts is because I had two major trunk lines of bonding cable converging near the transom—one with all the ER connections and one for the shaft struts, rudders and aft through hulls.
So you were just being tidy?
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Old 09-04-2019, 08:37 PM   #18
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I had to add a wire to the second bolt on my anode attachments this year.
Usually I have used a 5/8 drill to drill the anode for its double stud attachment. Last year I left the 5/8 bit in the drill press at the YC and this year I was to the point of having only the anode attachment to do before splashing when I realized that I didn't have a 5/8 bit. I drilled a 1/2" hole, but with the small misalignment that was solved by using a 5/8 bit, I could only get one bolt, one nut, on the anode. It does rest against the second bolt. On the inside, predictably, It was only the bolt that the anode rests against, not the one securely bolted to it, that was connected to the bonding wire. Hence the use of a length of stripped 14g wire wrapped between the two bolts on the inside.
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Old 09-04-2019, 09:30 PM   #19
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Angus99;
I've got something similar going on. I have a copper strip running down the center of the boat to which all the green bonding wires attach to. But when it get's to the stern, there is wire that attaches from that strip to a stainless plate near the transom that the auto pilot equipment is mounted to, then out the other end of that plate to the anode. So this stainless plate is being used as part of the circuit. Not the way it should be.

So I'm going to run the wire from the copper strip directly to one of the anodes studs (the way it should be). Then I will run a second wire from the other stud to a bus bar, then run separate wires from the bus to all the parts needing bonding at the transom (rudders, struts,thru hull, etc.) Then work my way forward, separating all the bonding wire connections, clean with a wire brush or replace terminal, apply anti corrosion , and re-attach. Should be good for a couple of days on my knees!
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Old 09-04-2019, 09:45 PM   #20
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Should be good for a couple of days on my knees!...
As are we all, as are we all!
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